/Engine/Source/Developer/DerivedDataCache/Public/DerivedDataCacheUsageStats.h
const [FDerivedDataCacheResourceStat](API\Developer\DerivedDataCache\FDerivedDataCacheResourceStat) & operator+ ( const [FDerivedDataCacheResourceStat](API\Developer\DerivedDataCache\FDerivedDataCacheResourceStat) & OtherStat )